A pre-weighed vessel was filled with oxy...

A pre-weighed vessel was filled with oxygen at NTP and weighed , It was then evacuated, filled with `SO_2` at the same temperature and pressure and again weighed. The weight of oxygen is:

The same as that of `SO_2`

1/2 that of`SO_2`

Twice that of `SO_2`

1/4 that of `SO_2`

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